Added Open Street Map layer to initial layer list.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1207 1c351a6f-456c-4935-88af-207f26c224cf
Surrounded image and elevation retrieval and read code with autorelease pools.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1208 1c351a6f-456c-4935-88af-207f26c224cf
Added VBO terrain rendering.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1209 1c351a6f-456c-4935-88af-207f26c224cf
Changed memory cache's use of NSDate to NSDate timeIntervalSinceReferenceDate.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1210 1c351a6f-456c-4935-88af-207f26c224cf
Added the methods project and unProject to WWNavigatorState, and their corresponding implementations in WWBasicNavigatorState.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1211 1c351a6f-456c-4935-88af-207f26c224cf
Added the screenProjection property to WWDrawContext.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1212 1c351a6f-456c-4935-88af-207f26c224cf
Removed unused methods from WWNavigatorState and WWBasicNavigatorState. Modified WWNavigatorState and WWBasicNavigatorState to follow the WWiOS coding conventions.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1213 1c351a6f-456c-4935-88af-207f26c224cf
Simplified the construction of frustumInModelCoordinates in WWBasicNavigatorState. Removed an unused method from WWFrustum.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1214 1c351a6f-456c-4935-88af-207f26c224cf
Modified WWElevationModel, WWBasicElevationModel, WWElevationTile, and WWElevationImage to follow the WWiOS coding conventions.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1215 1c351a6f-456c-4935-88af-207f26c224cf
Added documentation and some optimizations to WWBoundingBox.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1216 1c351a6f-456c-4935-88af-207f26c224cf
Repaired documentation typos in WWTile.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1217 1c351a6f-456c-4935-88af-207f26c224cf
Added parenthesis to the LONGITUDE_FOR_TIMEZONE macro in WWLocation to avoid macro expansion errors.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1218 1c351a6f-456c-4935-88af-207f26c224cf
Completed the implementation of WWBasicElevationModel elevationForLatitude:longitude:. Added the WWTileKey class, which is used by WWBasicElevationModel as a cache key.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1219 1c351a6f-456c-4935-88af-207f26c224cf
Modified WWBasicNavigator to compute its near clip distance using height above terrain.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1220 1c351a6f-456c-4935-88af-207f26c224cf
Handle exceptions in texture retrieval notification.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1221 1c351a6f-456c-4935-88af-207f26c224cf
Changes to return value from WWPVRTCImage.compressFile.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1222 1c351a6f-456c-4935-88af-207f26c224cf
Repaired an issue where WWMemoryCache evicts cache items randomly when making space.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1223 1c351a6f-456c-4935-88af-207f26c224cf
Completed the implementation of WWBasicElevationModel minAndMaxElevationsForSector:result:. Added minElevation and maxElevation properties to WWElevationModel and WWElevationImage.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1224 1c351a6f-456c-4935-88af-207f26c224cf
Repaired texture memory leak.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1225 1c351a6f-456c-4935-88af-207f26c224cf
Updated deployment target to 6.0.

git-svn-id: http://worldwind31.arc.nasa.gov/svn/trunk@1226 1c351a6f-456c-4935-88af-207f26c224cf